It comes with the auxiliary radiator and related hoses and mounting bracket, an 850w fan to replace the 600w stock fan, a new fan relay and wiring harness, brackets to relocate the horns, new spark plugs, and the code for the software flash (which the dealer will need when recoding you ECU). The air ducts are sold separately since the PPK2 fits on multiple cars with different bumper styles. RHD vehicles require an additional wire harness.